Worcester Bosch Heat Exchanger 30 Plate 8716118465

The Worcester Bosch 8716118465 is a 30-plate heat exchanger used in Greenstar Highflow 550CDi combi boilers. It sits in the domestic hot water circuit, where heat from the primary water is transferred across the plate stack to the mains-fed hot water supply. Over time the plates can scale, block or weep, which shows up as unstable hot water temperature or reduced flow at the tap.

• Hot water temperature swings between hot and cold during a draw-off
• Reduced hot water flow rate compared with the cold supply
• Water weeping from the plate stack or from the connections around it
• Scale or debris visible in the plate gaps, or a blocked secondary circuit
• Repeated lockouts or temperature-related fault codes on the boiler display

• Check the GC number and serial plate on the appliance against the compatibility list before ordering.
• Confirm the part number on the existing component matches 8716118465, and note the alternative and previous numbers listed above.
• Check whether a gasket or seal kit is needed for the connections being disturbed.
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.